The Integrated Amplifier which carries the super
feed-forward system newly developed as a technology of transcending the
threshold of NFB.
In order to compensate with the NFB technology adopted
with the conventional amplifier and to reduce distortion more, the super
feed-forward system developed uniquely is carried.
This circuitry is a circuitry which used as the base feed-forward theory
devised by Mr. H.S. Black in 1928, and is at an SANSUI,Although the likelihood
of practical use was explored in 1975, a Tips called combined use of a
NFB technology was carried out in its hands in frustration of what will
run and suspension and make an issue of the job restart of the research
continuously in 1978, and 1980, and this was completed at last.
Many problems which are the
circuitries in which a chisel is possible theoretically, and should be overcome although this feed-forward circuitry takes out only a distorted component from
the HARASHIN number and it was said with the output by making it into an
opposite phase that a synthetic and distortion are canceled were made into the
theory of a phantom. Then, the structure which connected the strength of both
NFB and feed forward with the super feed-forward system and with which it united
NFB is also making an additional post of the role which mainly
operates to a low-pass distorted modification, and takes out the opposite phase
distortion for feed forward hold. Moreover, the error collection amplifier for
feed forward is formed, and also full use of a computer technology is made, and
the distorted removal is enabled over the wide band by developing the summing
network of the output which can perform distorted cancellation also to 2 pole
While little design of the amount of NFB is attained and the stability
of amplifier increases by this super feed-forward system, TIM distortion
is mostly made to zero.
The diamond differential circuit
adopted as the AU-D series is carried.
A diamond differential circuit
considers it as the dual complimentary differential interconnection which
combined 2 sets of differential circuits up and down, and is carried in the
predrive stage. This is sending the required drive electric current into the
power stage faithfully also to the transitional and complicated peek input like a music signal.
Moreover, by 2 pole phase-compensation circuitry, the
operating range of NFB was expanded and the high-speed responsibility which was
excellent to the input signal is realized.
The three-dimensional solid
product line is performed and the signal path of the shortest distance is
completed at the same time it puts simple & straight-ization into practice and makes the fluence of a signal a very short-haul and simple.
the pattern from an input to an output is able to develop by ideal hand-held on
a printed circuit board stream composition along with the fluence of a circuit
diagram by having adopted the heat pipe for a heat dissipation. For this reason,
in the case where the conventional heat sink is used, the setups which brings
the difficult power stage and the driver stage close could be realized, and also
the adjacency setting of the two transistors which constitute a push pull output
circuit could be carried out, and leading about of the wire rod near [ through
which a large electrical power flows ] an output transistor is eliminated.
Moreover, with a twin relay speaker switchpoint, Speakers A and B are
changed and leading about of an output line is prevented.
acquired by AU-D907Limited is supplied, and the design which cannot receive
influences of a magnetic distortion including a substrate or a chassis structure
easily, such as adopting a wood bonnet, a bronze plating screw, and NM element
in large quantities, is put into practice.
Tone amplifier is excluded
and it has 2 amplifier stream compositions of a high gain equalizer amplifier
and power amplifier.
An equalizer uses the Dual FET of low-noise high gm for
the first rank, and is considering it as the push pull drive pure complimentary
SEPP output by two steps of differentials, and an electric-current differential
with a current mirror.
And DC servo is adopted in order to remove an output
capacitor, expecting a stabilization of DC area.
The newly developed
linear servo regulator is employed as the power-source part only for an
Since this stabilizing supply can perform the response stabilized
also to the transitional load intensity by sending a fixed bias current in a
circuitry, it makes the always clean and stable powering possible.
head amplifier which adopted the symmetrical circuitry of two steps of
differentials as MC cartridges is carried.
With this MC head amplifier, a
High position (0.1mV/100 ohms) and a Low position (0.25mV/100 ohms) can be
chosen so that it can respond also to the size of the output by the difference
in the type of a cartridge by preparing an input gain changeover switch.
A power-source part considers it as a right-and-left independent 2
power-source scheme, and has the 2 coil 2 power-source stream composition.
Moreover, the high speed capacitor with the flattery nature which is a
low-impedance type by low scaling-factor etching, and was excellent also in
transitional charge and discharge is used for a block capacitor.
Furthermore, first recovery diode with a quick switching speed is adopted as
rectifier diode, and the responsibility of a regulation is raised.
simple tone control circuit which consisted of CRs is carried.
Since it is a simple scheme without amplification elements, such as an
equalizer and power amplifier,The volume location is -6dB-0dB (at the time
of full power) with the design which is not effective in a tone control,
and a saturation is not started more than the amplification degree of amplifier
at the time of full power like before.
A Subsonic Filter, a supersonic filter, 2
circuitry tapes monitor, the recording selector / copy function, the audio
muting, the balance control, the input selector with Idi Kater, etc. are
There were two kinds, the black model of a rosewood tone bonnet
and the silver model of a white oak tone bonnet.
||Super feed-forward &DD/DC amplifier
|<Power amplifier part>
||95W+95W (8 ohm, 10Hz - 20kHz, THD 0.005%)
95W+95W (8 ohm, 1kz, THD 0.003%)
|THD (at the time of 10Hz - 20kHz, and an
||0.005% or less
|Cross modulation distortion (60Hz:7kHz=4:1,
||0.008% or less
|Output bandwidth (IHF, both channel operation, THD 0.02%)
||5Hz - 80kHz
|Dumping factor (new IHF, 20Hz - 20kHz)
|Frequency characteristic (1W)
|SN ratio (A network)
||110dB or more
||Below a limit of measurement
|TIM distortion (the Sqwtooth method)
||Below a limit of measurement
|Inside slew rate
|Input sensitivity/input impedance (1kHz)
||Phono1, 2 man-month:2.5mV /, 47kohm
Phono1, 2 MC (high/low): 100 microvolts, 250 microvolts/100 ohm
AUX, Tape Play1, 2:250mV / 27kohm
|Phono maximum permissible input (1kHz, THD
|An Output voltage/impedance (1kHz)
||Tape Rec: 250mV (47kohm)/600ohm
||Phono1, 2 man month: 0.005% or less (20Hz -
|RIAA deflection (man month)
|SN ratio (A network)
||Phono1, 2 man month: 90dB or more
Phono1, 2 MC: 74dB or more
|Phono input conversion noise
(A network, a short circuit)
|Phono1, 2 man-month:-142dBV
||Phono1, 2 man month: 60dB or more
Phono1, 2 MC: 50dB or more
Tuner, AUX, Tape Play: 80dB or more
||Bass: +6--8dB (50Hz)
||Bass: 150Hz, 300Hz
Treble: 3kHz, 6kHz
||Low: 16Hz (-3dB, 6 dB/oct)
(-3dB, 6 dB/oct)
|Power dissipation (Electrical Appliance and
Material Control Law)
||Width 445x height 163x depth of 403mm